ipl/web is a set of common web components for php projects. Prior to versions 0.13.1 and 0.10.3, the vulnerability allows an attacker to inject malicious Javascript into a victim's browser to run it in the context of Icinga Web. The victim needs to visit a specifically prepared website and may have no immediate chance to notice any wrongdoing. This issue has been patched in versions 0.13.1 and 0.10.3.
https://github.com/Icinga/ipl-web/security/advisories/GHSA-55wf-5m3q-6jjf
https://github.com/Icinga/ipl-web/releases/tag/v0.13.1
https://github.com/Icinga/ipl-web/releases/tag/v0.10.3
https://github.com/Icinga/ipl-web/commit/f387e92504d7a03bb857d1aee9b7410e06dd065d